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dc.contributor.authorMoule, D. C.-
dc.contributor.authorBascal, H. A.-
dc.contributor.authorSmeyers, Y. G.-
dc.contributor.authorClouthier, D. J.-
dc.contributor.authorKarolczak, J.-
dc.contributor.authorNiño, A.-
dc.identifierdoi: 10.1063/1.462935-
dc.identifierissn: 0021-9606-
dc.identifier.citationJournal of Chemical Physics 97: 3964-3972 (1992)-
dc.description9 pags., 7 figs., 5 tabs.-
dc.description.abstractJet-cooled, laser induced phosphorescence (LIP) excitation spectra of thioacetaldehyde (CH3CHS, CH3CDS, CD3CHS, and CD3CDS) have been observed in the 15 800-17 300 cm-1 region in a continuous pyrolysis jet. The responsible electronic transition, T1 ← S0, ã3A″ ← X̃ 1A′, results from an n → π* electron promotion and gives rise to a pattern of vibronic bands that can be attributed to activity of the methyl torsion and the aldehyde hydrogen out-of-plane wagging modes. Potential and kinetic energy surfaces were mapped out for the aldehyde wagging (α) and the torsional (Θ) internal coordinates by using 6-31G* Hartree-Fock calculations in which the structural parameters were fully relaxed. The potential and kinetic energy data points were fitted to double Fourier expansions in α and Θ and were incorporated into a two-dimensional Hamiltonian operator. The spectrum was simulated from the transition energies and the Franck-Condon factors and was compared to the observed jet cooled LIP spectra. It was concluded that while the RHF procedure gives a good description to the ground state dynamics, the triplet state surface generated by the UHF method is too bumpy and undulating. © 1992 American Institute of Physics.-
dc.description.sponsorshipD.C.M. and H. B. would like to thank the Natural Sciences and Engineering Research Council of Canada for financial support of this work. D.l.C. and 1.K. acknowledge the support of the National Science Foundation through Grant No. CHE-8914403. Y. G. S. and A. N. wish to thank the Comision Interministerial de Ciencias y Technologia for economic support through Grant No. PB 90- 0167.-
dc.publisherAmerican Institute of Physics-
dc.relation.isversionofPublisher's version-
dc.titleAn analysis of the methyl rotation and aldehyde wagging dynamics in the S0 (X̃ 1A′) and T1 (ã3A″) states of thioacetaldehyde from pyrolysis jet spectra-
dc.contributor.funderNatural Sciences and Engineering Research Council of Canada-
dc.contributor.funderNational Science Foundation (US)-
dc.contributor.funderComisión Interministerial de Ciencia y Tecnología, CICYT (España)-
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